The aim of this lecture is to present on the Chemistry of Respiration. The energy released during respiration is not used directly by cells. Instead it is used to make a molecule called ATP which stores the energy until it is needed. ATP means Adenosine triphosphate. ATP supplies energy for all the processes that need it. For example: movement, chemical reactions and growth. ATP is made when another molecule called adenosine diphosphate (ADP) is bonded to a third inorganic phosphate (Pi) using the energy released from glucose.